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Question Rough 7R - opinions

I have a rough looking 7R Mag case that id like opinions as to using it for my rebuild. All journals measured in 3 locations, averaged and within spec. My concern is the rough finish and some deep pitting inside the bottom of the case by the oil sump plate. I thought I may be able to fill these with JB or Weicon titanium repair stick.

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Old 09-13-2017, 03:49 PM
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Since I build Mezger cases you will probably think I have a vested interest in this discussion, but I want to tell you honestly that in my development period for these cases, me and my engineers and toolmakers have looked at dozens upon dozens of cases.

I have NEVER seen a case that is that bad.

I personally would not build a motor out of that case.

Mag 7R cases are somewhat easy to find; I would find a better example.
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Old 09-13-2017, 03:59 PM
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The big question is. Would someone abandon a good 7R case? Must be a reason for it to have been discarded. Any history on this case?
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Old 09-13-2017, 04:53 PM
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I've seen a few myself and this one would be placed in the metal recycling barrel.
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Old 09-13-2017, 05:20 PM
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That is a crusty mother......I have never seen a case that bad............I'd replace that and move on.

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Old 09-13-2017, 05:59 PM
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Hurricane damage from way back? Car drove into the ocean? Case set out in a sea side back yard. Or is salt water not that much a corrosive agent for this mag alloy?
Old 09-13-2017, 06:32 PM
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Sandblast it, then make a coffee table out of it....

There are supposedly aircraft welders that weld magnesium. There was a thread on here a while ago about someone in Wisconsin welding the fan units...
Old 09-13-2017, 06:37 PM
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Thanks for all the feedback. History - water and remaining oil sat in the bottom end for what appears to be a very long time. I sourced it for the crank which measured absolutely perfect; hatch marks could still easily be seen on the cylinder walls that hadnt corroded. My guess is the car was wrecked early in life and abandoned.

Last edited by GotaT; 09-13-2017 at 06:53 PM.. Reason: Update
Old 09-13-2017, 06:51 PM
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